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Finding the Fourth Proportional to 613.70, 920.70 and 180.85

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Solution

The fourth proportional to 613.70, 920.70 and 180.85 is: 271.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.70 : 920.70 = 180.85 : x
  2. Step 2: Convert to fraction form
    613.70/920.70 = 180.85/x
  3. Step 3: Cross multiply
    613.70x = 920.70 × 180.85
  4. Step 4: Simplify right side
    613.70x = 166,510.90
  5. Step 5: Solve for x
    x = 166,510.90/613.70
  6. Step 6: Final answer
    x = 271.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.